Yukio quotes (from trailers)
"I've been trying to find you for over a year."
"It's an honor to meet the Wolverine."
"My employer is dying. He wants to thank you for saving his life all those years ago."
"I wouldn't bother with them."
"I saw you die."

Actress Rila Fukushima's quotes
"My character's very physical." (Total Film, May 2013)
"Yukio and Wolverine have a lot in common. She really takes care of him and he also cares about her." (Total Film, May 2013)

Director James Mangold's quotes
"I would say [Wolverine and Yukio] have a unique relationship. She's lethal herself."
"She's a tremendous fighter."
"I think she's both sexy and almost kind of sprung from the anime world. It's a real badass character."

Little is known about the life of the adventurous Yukio before she became an assassin for the Japanese crimelord Lord Shingen, leader of Clan Yashida. As part of Shingen’s campaign against the mutant hero Wolverine, Yukio drugged Wolverine and brought him before Shingen who proceeded to shame him in battle. Later, Yukio manipulated Wolverine into helping her kill Shingen’s rival Katsuyori. Attracted to Wolverine, Yukio chafed at his love for Shingen’s daughter Mariko, but nevertheless saved Mariko’s life when her abusive husband threatened her.